package net.llz.interceoter;

import com.google.gson.Gson;
import io.jsonwebtoken.Claims;
import net.llz.util.JWTUtil;
import net.llz.util.JsonData;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class LoginIntercepter implements HandlerInterceptor {

    private static  final Gson gson =new Gson();


    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        String token = request.getHeader("token");
        if (token==null){
            token = request.getParameter("token");
        }
        if (token != null){
            Claims claims = JWTUtil.checkJWT(token);
            if (claims!=null){
                Integer userId = (Integer) claims.get("id");
                String name = (String) claims.get("name");
                request.setAttribute("user_id",userId);
                request.setAttribute("name",name);
                return true;
            }
        }

        sendJsonMessage(response, JsonData.buildSuccess("请登录"));
        return  false;
    }

    public static void sendJsonMessage(HttpServletResponse response,Object obj) throws IOException {
        response.setContentType("application/json; charset=utf-8");
        PrintWriter writer = response.getWriter();
        writer.println(gson.toJson(obj));
        writer.close();

        response.flushBuffer();
    }
}
